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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=57" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=5&size=small" /></div> <h1 class="ph">广电认为短期实现光纤入户难度大 </h1> <p class="xg1"> 时间：2011-4-14 08:39<a class="zz" href="home.php?mod=space&uid=5">作者：tlx</a> 阅读<em id="_viewnum">(908)</em> 评论: 0</p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=57" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>广电总局广科院总工杨杰近日表示，我国有线电视网络双向化改造的重点在接入网，但受限于设备投资、施工难度等困境，短时间内实现光纤入户比较难。</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content">广电总局广科院总工杨杰近日表示，我国有线电视网络双向化改造的重点在接入网，但受限于设备投资、施工难度等困境，短时间内实现光纤入户比较难。<BR><BR>据广电总局广科院总工杨杰介绍，我国NGB建设目标是用十年时间建成覆盖全国3亿家庭和连接2亿家庭的下一代广播电视网，突破三网融合中的“代差”瓶颈。他透露，NGB的发展方向是要是实现网络的双向化、业务的开放化、运营的规模化、监管的可控化、终端的智能化以及用户的个性化。并在技术上改造提升传统媒体，加快发展新媒体。<BR><BR>不过，他指出，目前有线电视网络双向化改造的重点在接入网。“我国居住环境以集中居住为主的多层公寓和高层公寓，如：接入干线传输采用PON技术后，最后100米接入技术，覆盖用户少于200户，未来是50户，甚至20户。”他举例解释。<BR><BR>双向化的改造要综合考虑设备投资、施工难度、运营管理等原因。鉴于目前双向化面临技术多样性、双向业务缺乏、商业模式不清晰，及投资资金来源有限的困境，杨杰表示，光纤入户短时间内实现比较难，“而最难的是施工问题不是技术问题”。</td></tr></table> <!--[diy=diycontentbottom]--><div id="diycontentbottom" class="area"></div><!--[/diy]--> <script src="data/cache/home.js?eOg" type="text/javascript"></script> <div id="click_div"><table cellpadding="0" cellspacing="0" class="atd"> <tr><td> <a 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